mất công
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Meaning
2 senses
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Verb
To spend time and energy on a task that eventually yields no useful result.
vi Tôi đã mất công cả ngày để sửa máy tính nhưng nó vẫn không hoạt động.
en I wasted the whole day trying to fix the computer, but it still doesn't work.
Adjective
Describing an action or effort that does not achieve any practical purpose or benefit.
vi Thật là mất công khi phải làm lại mọi thứ từ đầu.
en It is useless to have to redo everything from the beginning.